weekend pomera updates:
- i made a script that cobbles together an "immutable" NetBSD root filesystem out of the install sets with my local /etc changes, mounting /tmp and /var on tmpfs to avoid eMMC wear. thanks to NetBSD's cross-build support, i can assemble the system mostly offline, except for pkgsrc packages. would be nice to have a guix-like for other Unixes
- got multiple VTs working with the display
- started wiring up sensors like battery and USB power
- made the power button work